CN115235701B - Imaging device for underwater severe working conditions and environment adaptability verification method thereof - Google Patents
Imaging device for underwater severe working conditions and environment adaptability verification method thereof Download PDFInfo
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- CN115235701B CN115235701B CN202210666655.7A CN202210666655A CN115235701B CN 115235701 B CN115235701 B CN 115235701B CN 202210666655 A CN202210666655 A CN 202210666655A CN 115235701 B CN115235701 B CN 115235701B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012795 verification Methods 0.000 title claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 67
- 239000000565 sealant Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 229920001971 elastomer Polymers 0.000 claims description 28
- 239000003292 glue Substances 0.000 claims description 26
- 238000009863 impact test Methods 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000009413 insulation Methods 0.000 claims description 17
- 239000010453 quartz Substances 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000005357 flat glass Substances 0.000 claims description 16
- 230000003068 static effect Effects 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 14
- 238000013016 damping Methods 0.000 claims description 12
- 210000004907 gland Anatomy 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 229920002379 silicone rubber Polymers 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 claims description 2
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- 239000007787 solid Substances 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- General Physics & Mathematics (AREA)
- Studio Devices (AREA)
Abstract
The invention provides an imaging device for underwater severe working conditions and an environment adaptability verification method thereof, which are used for solving the technical problems that the current imaging device applied to the underwater reduces the influence of impact and temperature on the performance of the whole machine and the reliability of the adopted switching shielding device is poor. According to the invention, a sealing strip and sealant solid-liquid combined sealing method is adopted, the extrudability of the solid seal and the fillability of the liquid seal are combined through designing corresponding structural forms, and the tightness of the system is effectively improved. In the design of switchable unit, use the subassembly such as direct current motor, worm wheel, worm, hall switch, realize the autonomous working and the auto-lock function of switching function, the device compares in the past electromagnet drive switching, especially under this kind of high order impact environment, has the advantage that the reliability is high. The invention can bear the severe conditions of high-frequency high-magnitude vibration impact, high temperature, heat flow and the like, and simultaneously has the functions of autonomous underwater illumination and autonomous lens protection.
Description
Technical Field
The invention relates to the technical field of underwater imaging, in particular to an imaging device for underwater severe working conditions and an environment adaptability verification method thereof.
Background
When the imaging device needs to acquire images in a deepwater environment, the influence of water pressure on a system of the imaging device needs to be solved, meanwhile, the sealing problem needs to be solved, the pressure of the imaging device in a kilometer underwater environment can reach hundreds of atmospheric pressure, and the imaging device has a great challenge on the whole sealing machine. Meanwhile, the working environment of the imaging device is severe in vibration impact environment, the high-frequency impact can reach tens of thousands of g, the frequency can reach tens of thousands of Hz, in addition, the temperature of the installation surface of the imaging device is high and can reach 200 ℃, and in such severe environment, the impact on the whole performance of the machine is also challenging when the impact and the temperature are reduced. In addition, the quartz window of the imaging device is exposed in an underwater environment, high-temperature heat flow exists in the environment, and particles are very likely to damage the window of the imaging device under the high-frequency impact environment, so that the imaging device is suitable for being automatically switched, the shielding device is in a shielding state under the condition that the imaging device is not powered on, the device is required to have a self-locking function, the power consumption is reduced in the image acquisition stage, the switching device is required to be powered off, the switching device is required to be powered on, the position locking function is required to be used for the switching device after the switching, the electromagnet is adopted for driving the switching shielding device at present, and the reliability of the electromagnet driving can be greatly reduced under the high-magnitude impact environment.
Disclosure of Invention
The invention aims to solve the technical problem that the existing underwater imaging device has poor reliability when reducing the impact and temperature influence on the performance of the whole machine, and provides an imaging device for underwater severe working conditions and an environment adaptability verification method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an imaging device for underwater severe working conditions comprises an imaging unit, a switching unit, an autonomous lighting unit and a heat insulation vibration reduction unit;
the switching unit and the autonomous lighting unit are fixedly connected to the front side of the imaging unit through bolts, and the heat insulation vibration reduction units are arranged on two sides of the imaging unit;
The switching unit has autonomous working and self-locking functions and is used for autonomously switching the shielding imaging unit; the autonomous lighting unit is used for providing underwater lighting; the heat insulation vibration reduction unit is used for reducing the influence of impact and temperature on the performance of the whole machine;
The special feature is that:
the switching unit comprises a switching blade assembly, an upper cover, a shell, a worm assembly and a worm wheel assembly;
A glue injection groove is formed at the joint of the shell and the upper cover, a silicon rubber sealing strip is arranged in the glue injection groove, and sealing glue is injected to realize solid-liquid combined static seal;
The switching blade assembly comprises a blade and a blade rubber shielding ring, and the lens rubber shielding ring; the blade rubber shielding ring is adhered to the blade through sealant; the lens rubber shielding ring is adhered to the front side of the imaging unit through sealant; when the blade shields the lens of the imaging unit, the blade rubber shield ring is in circumferential contact with the lens rubber shield ring.
Further, the worm gear assembly comprises a blade driving shaft, at least 2 rubber sealing ring mounting grooves are formed in the blade driving shaft, and driving shaft dynamic sealing rubber rings are arranged in the mounting grooves; the blade driving shaft penetrates through the reserved hole of the upper cover to realize dynamic sealing; the imaging unit comprises a rectangular imaging unit shell and an imaging unit rear cover; sealing grooves are formed in the periphery of the mounting surfaces of the imaging unit shell and the imaging unit rear cover and used for injecting glue to mount sealing strips; glue injection holes are formed in four corners of the imaging unit shell.
Further, the worm assembly comprises a direct current drive motor, a motor end gear, a worm and a worm end gear;
The worm gear assembly comprises a Hall switch and a worm gear;
The direct current driving motor is connected with a motor end gear, and the motor end gear is meshed with a worm end gear; one end of the worm is fixedly connected with the worm end gear, and the other end of the worm is meshed with the worm wheel; one end of the blade driving shaft is fixedly connected with the worm wheel, and the other end of the blade driving shaft is connected with the blade; hall switches for feeding back positions are arranged at the shielding and opening positions of the blades;
The direct current driving motor drives the motor end gear to rotate, the motor end gear is meshed with the worm end gear to drive the worm end gear to rotate, the worm wheel is fixedly connected with the blade driving shaft, the blade driving shaft is synchronously rotated with the worm wheel and fixedly connected with the blade, and therefore the blade is driven to switch between opening and closing.
Further, the worm wheel is provided with magnetic steel for electric limiting and a mechanical limiting piece for mechanical limiting;
Angular contact bearings are arranged between the two ends of the worm and between the worm wheel and the bearing mounting seat and used for reducing friction.
Further, the autonomous lighting unit comprises a lamp panel, a pressing plate, quartz window glass and a spacer;
the pressing plate is fixedly connected with the imaging unit shell through a mounting screw; the quartz window glass is arranged at the front end of the lamp panel;
A first glue injection groove is formed between the pressing plate and the imaging unit shell, and a second glue injection groove is formed between the pressing plate and the quartz window glass;
the isolation pad is arranged between the pressing plate and the quartz window glass, and is made of polyimide;
and the sealant is uniformly smeared on the lamp panel and is not contacted with the quartz window glass.
Further, the heat-insulating vibration-damping unit comprises a vibration-damping pad, a gland, a fulcrum and a heat-insulating pad;
The fulcrum is in threaded connection with the gland; the heat insulation pad is arranged on the end face of the support shaft and the end face of the gland;
the vibration reduction pad is made of silicon rubber, and the pretightening force is compression amount of 2mm; the heat insulation pad is made of glass fiber reinforced plastic plates, and the thickness of the heat insulation pad is 2mm.
Further, the transmission ratio of the worm end gear to the motor end gear is 2:1;
the output rotating speed of the direct current driving motor is 17r/s;
The number of worm heads is 2, the diameter of the indexing circle of the worm wheel is 30mm, the mode is 0.5, and the number of teeth is 60.
The invention also provides an environmental adaptability verification method for the imaging device under the severe underwater working condition, which is characterized by comprising the following steps:
Step 1) static and dynamic tightness verification
1.1 Setting a test temperature and a test duration, and drying before the imaging device is covered;
1.2 Placing water absorption test paper at the sealing interface of the dry imaging device and the interface of the switching unit for sealing, and placing the imaging device in a sealing tank after sealing;
1.3 Connecting with a dynamic seal test device and a static seal test device to verify static and dynamic seal performance
2 Sealing windows are formed in the sealing tank, and a supercharger with a pressure gauge, a power supply and a video display are installed, wherein the power supply and the video display are connected with the imaging device; the tightness is confirmed by observing the image condition of the imaging device, the operation condition of the switching unit and the power supply current and voltage condition in the pressurizing process in the sealing tank and comparing the changes of the water absorption test paper before and after the dynamic and static sealing test;
step 2) verification of high-pressure water flow vibration impact test
The imaging device is arranged in a test cavity and is connected with a power supply and upper computer software, and the test cavity is fixedly arranged on a vibration impact test bed; the high-pressure water gun is used for impacting the imaging device, the vibration impact test bed is started, the upper computer is used for controlling the opening of the blades, the actual position information is read, and whether the test bed is opened or not is judged.
Further, in the step 1.1), the test temperature is higher than 55 ℃ and the test time is longer than 4 hours;
In step 1.3), the pressure of the supercharger is in the range of 1-2MPa.
Further, the step 2 specifically comprises:
2.1 Selecting the direction of a central optical axis of imaging of a lens of an imaging device as a vibration impact test direction, wherein the water outlet direction of the high-pressure water gun is +X direction and is opposite to the optical lens, and sealing the interface of the high-pressure water gun and the test cavity; the impact test direction of the impact test bed is the-X direction, and the water outlet pressure of the high-pressure water gun is 1-2Mpa;
2.2 Before the test, the imaging device is electrified, the switching blade is positioned at the initial position of the front end of the lens, and the upper computer software can read the video image and the blade position information;
2.3 Opening a high-pressure water gun, realizing water flow impact to the switching blade, opening a vibration impact test bed, respectively loading tens of thousands of g impact tests and high-magnitude random vibration tests, controlling the opening of the blade by using an upper computer, reading the actual position information of the blade by using upper computer software in the test, and judging whether the blade is opened or not.
Compared with the prior art, the invention has the following beneficial technical effects:
According to the invention, a sealing strip and sealant solid-liquid combined sealing method is adopted, the extrudability of the solid seal and the fillability of the liquid seal are combined through designing corresponding structural forms, and the tightness of the system is effectively improved. In the design of switchable unit, use the subassembly such as direct current motor, worm wheel, worm, hall switch, realize the autonomous working and the auto-lock function of switching function, the device compares in the switching of former electro-magnet drive, has the advantage that the reliability is high, especially under this kind of high-order impact environment, electro-magnet drive's reliability can be discounted greatly.
The invention is an imaging device applied to thousands of meters of water and bearing severe conditions such as high-frequency high-magnitude vibration impact, high temperature, heat flow and the like, has the functions of autonomous underwater illumination and autonomous lens protection, and can avoid damage to lenses caused by heat flow and underwater moving particles in the high-magnitude impact environment.
Drawings
FIG. 1 is a schematic illustration of an embodiment of an imaging device for use in severe underwater conditions according to the present invention; wherein, (a) is in a locking state and (b) is in an opening state;
FIG. 2 is a schematic view of a sealing structure of an imaging unit according to an embodiment of the present invention; wherein, (a) is an axial side view and (b) is a partial side view;
FIG. 3 is a schematic view of an autonomous lighting unit sealing structure in an embodiment of the present invention;
FIG. 4 is a diagram showing the appearance of a switching unit according to an embodiment of the present invention;
FIG. 5 is a schematic view of a worm assembly according to an embodiment of the invention;
FIG. 6 is a schematic view of a worm gear assembly according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a switching component according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a thermal isolation and vibration reduction unit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a static and dynamic seal verification method according to an embodiment of the present invention:
FIG. 10 is a schematic diagram of a high pressure water flow vibration impact test verification in an embodiment of the present invention:
Reference numerals:
1-imaging unit, 2-switching unit, 3-autonomous lighting unit, 4-heat-insulating vibration-damping unit;
11-imaging unit shell, 12-imaging unit rear cover, 13-sealing groove, 14-sealing strip, 15-glue injection hole, 16-buckle and 17-mounting through hole;
The device comprises a switching blade assembly, 211-blades, 212-blade rubber shielding rings, 213-lens rubber shielding rings, 22-upper covers, 23-shells, 24-worm assemblies, 241-direct current driving motors, 242-mounting brackets, 243-motor mounting brackets, 244-motor end gears, 245-worms, 246-worm end gears, 247-angular contact bearings, 248-bearing outer pressing rings, 249-bearing inner pressing rings, 250-gear pressing plates, 25-worm gear assemblies, 251-blade driving shafts, 252-driving shaft dynamic seal rubber rings, 253-bearing mounting seats, 254-Hall switches, 255-mechanical limiting sheets, 256-magnetic steels and 257-worm gears;
31-a lamp panel, 32-a pressing plate, 33-quartz window glass, 34-a spacer, 35-a first glue injection groove, 36-a second glue injection groove and 37-a mounting screw;
41-vibration damping pad, 42-gland, 43-fulcrum, 44-heat insulation pad and 45-M2 countersunk head screw.
Detailed Description
In order to make the objects, advantages and features of the present invention more apparent, the following describes in further detail an imaging device for underwater severe conditions and an environmental suitability verification method thereof according to the present invention with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1 (a) and (b), an imaging device for a severe underwater condition includes an imaging unit 1, a switching unit 2, an autonomous lighting unit 3, and a thermal insulation and vibration reduction unit 4.
According to the invention, a sealing strip and sealant solid-liquid combined sealing method is adopted, so that the solid extrudability and the liquid filling moldability are combined through designing corresponding structural forms, and the tightness of the system is effectively improved.
Sealing design of imaging unit 1
As shown in fig. 2 (a) and 2 (b), the imaging unit 1 includes an imaging unit housing 11 and an imaging unit rear cover 12. The imaging unit shell 11 and the imaging unit rear cover 12 are square, 4 sealing grooves 13 are formed in the periphery of the mounting surfaces of the imaging unit shell 11 and the imaging unit rear cover, the width of each sealing groove 13 is 3.8mm, the tolerance is 0-minus 10 wires, the depth is 2mm, the tolerance is 0-minus 10 wires, each sealing groove 13 is used for mounting 4 sealing strips 14 with phi of 2.65mm, the sealing strips 14 are mounted with glue, GD414 silicone rubber is filled in each sealing groove 13, and the sealing performance is improved by means of the fluidity of glue solution. Four corners of the imaging unit shell 11 are provided with 4 phi 6mm glue injection holes 15 with the depth of 2mm, GD414 silicon rubber is filled in the holes, one end of each glue injection hole 15 is in contact connection with the imaging unit rear cover 12, the other end of each glue injection hole is provided with 4-M4 threaded holes, and the imaging unit shell 11 is fixedly connected with the imaging unit rear cover 12 through 4M 4 screws. A step-shaped buckle 16 is further arranged between the imaging unit shell 11 and the imaging unit rear cover 12, and glue is injected on the contact surface of the buckle 16, so that the tightness is improved. Meanwhile, the rear cover 12 of the imaging unit is also provided with a mounting through hole 17 for mounting the 4-M4 screw, which is designed as M5, and can be used as a through hole of the M4 screw or a process hole in the process of disassembling the rear cover, and the rear cover 12 of the imaging unit is disassembled by screwing the M5 screw diagonally.
Sealing design of autonomous lighting unit
As shown in fig. 3, the autonomous lighting unit 3 can effectively provide light supplementing support, and the autonomous lighting assembly needs to be subjected to sealing treatment in consideration of the underwater environment. The autonomous lighting unit 3 comprises a lamp panel 31, a pressing plate 32, quartz window glass 33 and a spacer 34. The pressing plate 32 is fixedly connected to the imaging unit housing 11 by mounting screws 37. A first glue injection groove 35 is formed between the pressing plate 32 and the imaging unit shell 11, a second glue injection groove 36 is formed between the pressing plate 32 and the quartz window glass 33, a separation pad 34 is arranged between the pressing plate 32 and the quartz window glass 33, polyimide is used as a material of the separation pad 34, and the separation pad has certain strength and can avoid damage to the quartz window glass 33 in the pressing process of the pressing plate. And GD414 sealant is uniformly smeared on the lamp panel 31, components on the lamp panel 31 are sealed in the sealant, and meanwhile, the sealant is ensured not to contact the quartz window glass 33, so that the light transmission aperture of illumination is affected.
Switching unit 2 structure and sealing design thereof
In the design of switchable unit 2, use components such as direct current motor, worm wheel, worm, hall switch, realize the autonomous working and the self-locking function of switching function, the device compares in the switching of former electro-magnet drive, has the advantage that the reliability is high. The upper cover 22 and the shell 23 in the switching unit 2 are sealed by adopting a sealing strip and sealant solid-liquid combination sealing method, and the sealing mode is completely the same as that between the imaging unit shell 11 and the imaging unit rear cover 12. The inside of the switching unit 2 is mainly composed of a switching blade assembly 21, an upper cover 22, a housing 23, a worm assembly 24, and a worm wheel assembly 25, as shown in fig. 4.
The interface of the shell 23 and the upper cover 22 is provided with a glue injection groove, GD414 sealant is injected into the groove, and meanwhile, a silicon rubber sealing strip is placed in the groove, so that a solid-liquid combined static sealing state is realized.
As shown in fig. 5, the worm assembly 24 includes a dc drive motor 241, a mounting bracket 242, a motor mounting bracket 243, a motor end gear 244, a worm 245, a worm end gear 246, an angular contact bearing 247, a bearing inner press ring 249, a bearing outer press ring 248, and a gear press plate 250.
The number of heads of the designed worm 245 is 2, the modulus is 0.5, the diameter of a reference circle is 10mm, the lead is 1.57, and the lead angle of the reference circle is 2.8654 degrees, so that the self-locking function can be realized.
As shown in fig. 6, the worm wheel assembly 25 includes an upper cover 22, a vane 211, a vane drive shaft 251, a drive shaft dynamic seal rubber ring 252, a bearing mount 253, an angular contact bearing 247, a hall switch 254, a mechanical limit piece 255, a magnetic steel 256, and a worm wheel 257.
The worm 245 drives the worm wheel 257 to rotate by 100 degrees to open the blade 211, the blade 211 cannot appear in the view field of the imaging unit 1, the Hall switch component is selected for position feedback, one Hall switch 254 is respectively placed at the shielding and opening positions of the blade 211, the magnetic steel 256 is arranged on the worm wheel 257, electric limiting is achieved, and mechanical limiting is completed by a mechanical limiting piece 255 arranged on the worm wheel 257.
The worm wheel 257 can be opened by rotating 100 degrees from the initial shielding position, the field of view of the imaging unit 1 is not interfered, meanwhile, the switching time is required to be less than 1s, the number of heads of the worm 245 is 2, the pitch circle diameter of the worm wheel 257 is 30mm, the mode is 0.5, the number of teeth is 60, the blades 211 need to rotate (100/360) 60=17 teeth from shielding to opening, the worm 245 needs to rotate 8.5 turns, the transmission ratio of the worm end gear 246 to the motor end gear 244 is 2:1, the output rotating speed of the direct current driving motor 241 is 17r/s, the requirement can be met, and the switching requirement of not more than 1s can be realized by selecting a direct current motor and reduction gearbox combination with the rotating speed of 25 turns.
The bearing outer pressing ring 248 is mounted on the motor mounting bracket 243 through 4 screws and is used for pressing the bearing outer ring; the bearing inner pressing ring 249 is provided with an inner thread for pressing the bearing inner ring. The gear press plate 250 is used to secure the gears to the motor shaft or worm 257.
As shown in fig. 7, the switching blade assembly includes a blade 211, a blade rubber barrier ring 212, and a lens rubber barrier ring 213.
The blade rubber barrier ring 212 is adhered to the blade 211 by a sealant, and the lens rubber barrier ring 213 is adhered to the lens by a sealant, and when the blade 211 shields the lens, the blade rubber barrier ring 212 circumferentially contacts the lens rubber barrier ring 213.
In the working process of the switching unit 2, a direct current driving motor 241 in the worm assembly 24 drives a motor end gear 244 to rotate, the motor end gear 244 is meshed with a worm end gear 246 so as to drive the worm end gear 246 to rotate, the transmission ratio is 1:2, the worm end gear 246 is fixedly connected with a worm 245, the worm 245 synchronously rotates with the worm end gear 246, the worm 245 is meshed with a worm wheel 257, the worm 245 rotates for one circle according to the designed transmission relation of the worm wheel and the worm, the worm wheel 257 rotates for 2 teeth, meanwhile, the worm wheel 257 is fixedly connected with a blade driving shaft 251, the blade driving shaft 251 synchronously rotates with the worm wheel 257, and the blade 211 is fixedly connected with the blade driving shaft 251 so as to drive the blade 211 to realize the switching process of opening and closing. The vane driving shaft 251 passes through the reserved hole on the upper cover 22, meanwhile, 2 rubber sealing ring mounting grooves are designed on the vane driving shaft 251, the driving shaft dynamic sealing rubber ring 252 is mounted on the vane driving shaft 251, and meanwhile, the vane driving shaft 251 passes through the upper cover 22, so that dynamic sealing is realized.
Angular contact bearings 247 are installed between two ends of the worm 245, the worm wheel 257 and the bearing installation seat 253, so that low-friction stable rotation of the worm 245 and the worm wheel 257 is realized.
Heat-insulating vibration-damping unit
The temperature of the installation surface of the imaging unit 1 is up to 200 ℃, and the imaging unit 1 at least needs to continuously work for 20min under the working condition of the temperature, and meanwhile, the imaging unit 1 needs to bear the impact response with the magnitude of tens of thousands of grams and the frequency of tens of thousands of hz, so that the heat insulation and vibration reduction unit 4 needs to be added to play a role in vibration reduction and heat insulation. As shown in fig. 8, the heat-insulating vibration-damping unit 4 comprises a vibration-damping pad 41, a gland 42, a support shaft 43 and a heat-insulating pad 44, wherein the vibration-damping pad 41 is made of silicon rubber, the support shaft 43 is in threaded connection with the gland 42, the pretightening force of the vibration-damping pad 41 is adjusted by adjusting the compression degree of the threads, and in the application environment, the pretightening force of the vibration-damping pad 41 is adjusted to be 2mm in compression. After the vibration reduction pad 41, the support shaft 43 and the gland 42 are installed, a layer of heat insulation pad 44 is installed on the end face of the support shaft 43 and the end face of the gland 42, and the heat insulation pad 44 is made of glass fiber reinforced plastic plates and has a thickness of 2mm. The heat insulating pad 44 is connected to the end face of the support shaft 43 and the end face of the gland 42 by M2 countersunk screws 45.
The method for verifying the environmental suitability of the imaging device for the underwater severe working condition comprises the following specific steps:
After the imaging device is installed, water tightness and switchable test verification are required to be carried out, so that the imaging device can work normally in a specific environment.
Static and dynamic sealing performance verification:
Before the imaging device is sealed, a drying test is firstly carried out, the test temperature is +55 ℃, the test duration is 4 hours, after the unit drying is finished, water absorption test paper is placed at the sealing interface of the dried imaging device and the switching unit interface, and then the sealing is carried out. After the sealing cover is closed, the imaging device is placed in the sealing tank, and the tightness is confirmed by observing the image condition in the pressurizing process, the operation condition of the switching unit, the power supply current and voltage condition and comparing the change of the water absorption test paper before and after the dynamic and static sealing test.
The dynamic and static seal test mainly comprises a seal tank, a booster, a pressure gauge, a power supply and a video display, wherein a verification device is shown in fig. 9, and 2 seal windows are formed in the seal tank and are used for installing the booster with the pressure gauge, the power supply connected with an imaging device and the video display. The pressure of the booster can be increased to hundreds of atmospheric pressure to realize thousands of m water pressure.
High-pressure water flow vibration impact test verifies that:
The switching unit 2 mainly plays a role in providing shielding effect for the lens, avoiding damage to the lens caused by heat flow, particles and the like in a high-speed impact environment, and an impact object can influence the switching unit 2 to switch the blades, so that whether the blades can finish opening actions in a vibration impact environment or not is verified through experiments.
In the embodiment, the impact object is simulated mainly through high-pressure water flow, and in the process of tens of thousands of g of high-frequency impact tests and high-magnitude random vibration, the blades are impacted through the high-pressure water flow, so that whether the switching blades can be normally opened is verified in the environment.
As shown in fig. 10, the imaging device is installed in the test chamber, and is connected with the power supply and the upper computer software, and is fixedly placed on the vibration impact test stand. The optical axis direction is selected as the vibration impact test direction, the water outlet direction of the high-pressure water gun is +X direction and is opposite to the optical lens, the interface of the high-pressure water gun and the test cavity is sealed, high-pressure water is prevented from overflowing from the front of the cavity, the impact test direction of the impact test stand is-X direction, the water outlet pressure of the high-pressure water gun is 1-2Mpa, the imaging device is electrified before the test, the switching blade is positioned at the initial position of the front end of the lens, the upper computer software can read the position information of the video image and the switching blade, at the moment, the high-pressure water gun is started, the vibration impact test stand is started in the process of realizing water flow impact by just opposite to the switching blade, the ten thousand g impact test and the high-level random vibration test are respectively loaded, meanwhile, the upper computer is started to control the blade 211 to be started, the actual position information of the blade 211 is read by the upper computer software in the test, and whether the test is opened or not is judged.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. An imaging device for underwater severe working conditions comprises an imaging unit (1), a switching unit (2), an autonomous lighting unit (3) and a heat insulation and vibration reduction unit (4);
the switching unit (2) and the autonomous lighting unit (3) are fixedly connected to the front side of the imaging unit (1) through bolts, and the heat insulation vibration reduction units (4) are arranged on two sides of the imaging unit (1);
The switching unit (2) has autonomous working and self-locking functions, and autonomously switches the shielding imaging unit (1); the autonomous lighting unit (3) is for providing underwater lighting; the heat insulation and vibration reduction unit (4) is used for reducing the influence of impact and temperature on the performance of the whole machine;
the method is characterized in that:
the switching unit (2) comprises a switching blade assembly (21), an upper cover (22), a shell (23), a worm assembly (24) and a worm wheel assembly (25);
the interface of the shell (23) and the upper cover (22) is provided with a glue injection groove, a silicon rubber sealing strip is arranged in the glue injection groove, and sealing glue is injected to realize solid-liquid combined static seal;
the switching blade assembly (21) comprises a blade (211), a blade rubber shielding ring (212) and a lens rubber shielding ring (213); the blade rubber shielding ring (212) is adhered to the blade (211) through sealant; the lens rubber shielding ring (213) is adhered to the front side of the imaging unit (1) through sealant; when the blade (211) shields the lens of the imaging unit (1), the blade rubber shielding ring (212) is in circumferential contact with the lens rubber shielding ring (213);
The worm gear assembly (25) comprises a blade driving shaft (251), wherein at least 2 rubber seal ring mounting grooves are formed in the blade driving shaft (251), and driving shaft movable seal rubber rings (252) are arranged in the mounting grooves; the blade driving shaft (251) passes through a hole reserved in the upper cover (22) to realize dynamic sealing; the imaging unit (1) comprises a rectangular imaging unit housing (11) and an imaging unit rear cover (12); a sealing groove (13) is formed around the mounting surfaces of the imaging unit shell (11) and the imaging unit rear cover (12) and is used for injecting glue to mount a sealing strip (14); glue injection holes (15) are formed in four corners of the imaging unit shell (11);
the worm assembly (24) comprises a direct current drive motor (241), a motor end gear (244), a worm (245) and a worm end gear (246);
The worm gear assembly (25) includes a hall switch (254) and a worm gear (257);
The direct current driving motor (241) is connected with a motor end gear (244), and the motor end gear (244) is meshed with a worm end gear (246); one end of the worm (245) is fixedly connected with a worm end gear (246), and the other end of the worm is meshed with a worm wheel (257); one end of the blade driving shaft (251) is fixedly connected with the worm wheel (257), and the other end of the blade driving shaft is connected with the blade (211); the shielding and opening positions of the blades (211) are respectively provided with a Hall switch (254) for feeding back the position;
The direct current driving motor (241) drives the motor end gear (244) to rotate, the motor end gear (244) is meshed with the worm end gear (246), the worm end gear (246) is driven to rotate, the worm wheel (257) is fixedly connected with the blade driving shaft (251), the blade driving shaft (251) and the worm wheel (257) synchronously rotate and are fixedly connected with the blade (211), and accordingly the blade (211) is driven to switch between opening and closing.
2. The imaging device for severe conditions under water of claim 1, wherein:
The worm wheel (257) is provided with magnetic steel (256) for electric limiting and a mechanical limiting piece (255) for mechanical limiting;
Angular contact bearings (247) are arranged at two ends of the worm (245) and between the worm wheel (257) and the bearing mounting seat (253) and used for reducing friction.
3. The imaging device for severe conditions under water of claim 2, wherein:
The autonomous lighting unit (3) comprises a lamp panel (31), a pressing plate (32), quartz window glass (33) and a separation pad (34);
The pressing plate (32) is fixedly connected with the imaging unit shell (11) through a mounting screw (37); the quartz window glass (33) is arranged at the front end of the lamp panel (31);
A first glue injection groove (35) is formed between the pressing plate (32) and the imaging unit shell (11), and a second glue injection groove (36) is formed between the pressing plate (32) and the quartz window glass (33);
The isolation pad (34) is arranged between the pressing plate (32) and the quartz window glass (33), and is made of polyimide;
and the lamp panel (31) is uniformly coated with sealant, and the sealant is not contacted with the quartz window glass (33).
4. An imaging device for use in severe conditions under water according to claim 1 or 2 or 3, wherein:
The heat-insulating vibration-damping unit (4) comprises a vibration-damping pad (41), a gland (42), a fulcrum (43) and a heat-insulating pad (44);
the fulcrum (43) is in threaded connection with the gland (42); the heat insulation pad (44) is arranged on the end face of the support shaft (43) and the end face of the gland (42);
The vibration reduction pad (41) is made of silicon rubber, and the pretightening force is 2mm in compression; the heat insulation pad (44) is made of glass fiber reinforced plastic plates and has a thickness of 2mm.
5. The imaging device for severe conditions under water of claim 4, wherein:
The transmission ratio of the worm end gear (246) to the motor end gear (244) is 2:1;
The output rotating speed of the direct current driving motor (241) is 17r/s;
the number of heads of the worm (245) is 2, the pitch circle diameter of the worm wheel (257) is 30mm, the mode is 0.5, and the number of teeth is 60.
6. An environmental suitability verification method for an imaging device for an underwater severe condition, employing the imaging device for an underwater severe condition according to any one of claims 1 to 5, characterized by comprising the steps of:
Step 1) static and dynamic tightness verification
1.1 Setting a test temperature and a test duration, and drying before the imaging device is covered;
1.2 Placing water absorption test paper at the sealing interface of the dry imaging device and the interface of the switching unit (2) for sealing, and placing the imaging device in a sealing tank after sealing;
1.3 Connecting with a dynamic seal test device and a static seal test device to verify static and dynamic seal performance
2 Sealing windows are formed in the sealing tank, and a supercharger with a pressure gauge, a power supply and a video display are installed, wherein the power supply and the video display are connected with the imaging device; the tightness is confirmed by observing the image condition of the imaging device, the operation condition of the switching unit and the power supply current and voltage condition in the pressurizing process in the sealing tank and comparing the changes of the water absorption test paper before and after the dynamic and static sealing test;
step 2) verification of high-pressure water flow vibration impact test
The imaging device is arranged in a test cavity and is connected with a power supply and upper computer software, and the test cavity is fixedly arranged on a vibration impact test bed; the high-pressure water gun is used for impacting the imaging device, the vibration impact test bed is started, the upper computer is used for controlling the blade (211) to open, the actual position information is read, and whether the test bed is opened or not is judged.
7. The method for verifying the environmental suitability of an imaging device for severe underwater conditions according to claim 6, wherein:
In the step 1.1), the test temperature is higher than 55 ℃, and the test time is longer than 4 hours;
In step 1.3), the pressure of the supercharger is in the range of 1-2MPa.
8. The method for verifying the environmental suitability of an imaging device for severe underwater conditions according to claim 6, wherein step 2) specifically comprises:
2.1 Selecting the direction of a central optical axis of imaging of a lens of an imaging device as a vibration impact test direction, wherein the water outlet direction of the high-pressure water gun is +X direction and is opposite to the optical lens, and sealing the interface of the high-pressure water gun and the test cavity;
The impact test direction of the impact test bed is the-X direction, and the water outlet pressure of the high-pressure water gun is 1-2Mpa;
2.2 Before the test, the imaging device is electrified, the switching blade is positioned at the initial position of the front end of the lens, and the upper computer software can read the video image and the position information of the blade (211);
2.3 Opening a high-pressure water gun, realizing water flow impact to the switching blade, opening a vibration impact test bed, respectively loading tens of thousands of g impact tests and high-magnitude random vibration tests, controlling the opening of the blade (211) by using an upper computer, reading actual position information of the blade (211) by using upper computer software in the test, and judging whether the blade is opened or not.
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